U.S. patent application number 12/243304 was filed with the patent office on 2009-04-30 for light-filtering module and projecting system applied therewith.
This patent application is currently assigned to ASIA OPTICAL CO., INC.. Invention is credited to Chien-Chih HSIUNG, Wen-Lang Hung, Yi-Chung Hung, Chao-Yang Ke, Keng-Hui Lin, Wei-Hsiang Peng, Tzu-Lung Wu.
Application Number | 20090109408 12/243304 |
Document ID | / |
Family ID | 40582383 |
Filed Date | 2009-04-30 |
United States Patent
Application |
20090109408 |
Kind Code |
A1 |
HSIUNG; Chien-Chih ; et
al. |
April 30, 2009 |
LIGHT-FILTERING MODULE AND PROJECTING SYSTEM APPLIED THEREWITH
Abstract
A light-filtering module includes a light-source module, a
dichroic mirror and a first image unit. The light-source module
outputs a light beam. The dichroic mirror divides the light beam
into a first colored light and a dual colored light. The first
image unit provides the first colored light with image information.
The light-filtering module includes a light-filtering unit and a
driving unit. The light-filtering unit located between the dichroic
mirror and the first image unit is located at a light path of the
first colored light. The driving unit includes a coupling element
coupled to the light-filtering unit and a driving element utilized
to drive the coupling element. The driving element drives the
light-filtering unit, switching between a first status and a second
status by the coupling element, and a wide-wavelength spectrum and
a narrow-wavelength spectrum are provided when the light-filtering
unit is in the first and second statuses, respectively.
Inventors: |
HSIUNG; Chien-Chih;
(Taichung, TW) ; Wu; Tzu-Lung; (Taichung, TW)
; Lin; Keng-Hui; (Taichung, TW) ; Hung;
Wen-Lang; (Taichung, TW) ; Peng; Wei-Hsiang;
(Taichung, TW) ; Ke; Chao-Yang; (Taichung, TW)
; Hung; Yi-Chung; (Taichung City, TW) |
Correspondence
Address: |
THOMAS, KAYDEN, HORSTEMEYER & RISLEY, LLP
600 GALLERIA PARKWAY, S.E., STE 1500
ATLANTA
GA
30339-5994
US
|
Assignee: |
ASIA OPTICAL CO., INC.
Taichung
TW
|
Family ID: |
40582383 |
Appl. No.: |
12/243304 |
Filed: |
October 1, 2008 |
Current U.S.
Class: |
353/84 ; 362/282;
362/293 |
Current CPC
Class: |
G03B 21/14 20130101;
G03B 33/12 20130101; G03B 21/2053 20130101 |
Class at
Publication: |
353/84 ; 362/293;
362/282 |
International
Class: |
G03B 21/14 20060101
G03B021/14; F21V 9/00 20060101 F21V009/00; F21V 17/02 20060101
F21V017/02 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 24, 2007 |
TW |
096139869 |
Claims
1. A light-filtering module applied in a projecting system
comprising a first colored light, comprising: a light-filtering
unit located at a light path of the first colored light; and a
driving unit comprising a coupling element coupled to the
light-filtering unit and a driving element utilized to drive the
coupling element; wherein the driving element drives the
light-filtering unit to be switched between a first status and a
second status by the coupling element, and a wide-wavelength
spectrum and a narrow-wavelength spectrum are provided when the
light-filtering unit is in the first and second statuses,
respectively.
2. The light-filtering module as claimed in claim 1, wherein the
light-filtering unit comprises a front light filtering sheet
providing a first wavelength range spectrum and a rear light
filtering sheet providing a second wavelength range spectrum.
3. The light-filtering module as claimed in claim 2, wherein the
first wavelength range of the first wavelength spectrum is wider
than the second wavelength range of the second wavelength
spectrum.
4. The light-filtering module as claimed in claim 3, wherein the
driving element of the light-filtering unit is coupled to the rear
light filtering sheet, and the rear light filtering sheet is
removed from the light path of the first colored light by the
coupling element when the light-filtering unit is in the first
status.
5. The light-filtering module as claimed in claim 4, wherein the
driving unit further comprises a frame provided for installation of
the rear light filtering sheet, the coupling element is a gear rack
disposed on the frame, the driving element of the driving unit
motionally drives the coupling element, and the driving element of
the driving unit connected to a gear engaged to the gear rack.
6. The light-filtering module as claimed in claim 5, wherein the
coupling element is rotatably driven by the driving element.
7. The light-filtering module as claimed in claim 1, wherein the
light-filtering unit comprises a band pass filter.
8. The light-filtering module as claimed in claim 7, wherein the
band-pass filter comprises a normal line, wherein the normal line
of the band-pass filter is perpendicular to the light path of the
first colored light when the light-filtering unit is in the first
status, and the normal line of the band-pass filter is not
perpendicular to the light path of the first colored light when the
light-filtering unit is in the second status.
9. The light-filtering module as claimed in claim 8, wherein the
normal line of the band-pass filter is angled with the light path
of the first colored light from 20 to 30 degrees when the
light-filtering unit is in the second status.
10. The light-filtering module as claimed in claim 8, wherein the
driving unit further comprises a frame provided for installation of
the rear light filtering sheet, and the coupling element is a cam
lever coupled to the frame and driven by the driving element to be
reciprocally rotated.
11. A projecting system, comprising: a light-source module
outputting a light beam; a dichroic mirror dividing the light beam
into a first colored light and a dual colored light; a
light-filtering unit located at a light path of the first colored
light; and a driving unit, comprising: a coupling element coupled
to the light-filtering unit; and a driving element utilized to
drive the coupling element, wherein the driving element drives the
light-filtering unit to be switched between a first status and a
second status by the coupling element, providing a wide-wavelength
spectrum and a narrow-wavelength spectrum, respectively.
12. The projecting system as claimed in claim 11 further comprising
a first image unit providing the first colored light with image
information, wherein the light-filtering unit is located between
the dichroic mirror and the first image unit.
13. The projecting system as claimed in claim 12, wherein the
light-filtering unit comprises a front light filtering sheet to be
penetrated by a first wavelength range spectrum and a rear light
filtering sheet to be penetrated by a second wavelength range
spectrum.
14. The projecting system as claimed in claim 13, wherein the first
wavelength range of the first wavelength spectrum is wider than the
second wavelength range of the second wavelength spectrum.
15. The projecting system as claimed in claim 14, wherein the
driving element drives the rear light filtering sheet to be
linearly moved via the coupling element to remove the rear light
filtering sheet from the light path of the first colored light when
the light-filtering unit is in the first status.
16. The projecting system as claimed in claim 15, wherein the
driving unit further comprises a frame provided for installation of
the rear light filtering sheet, the coupling element is a gear rack
disposed on the frame, the driving element is a motor utilized to
drive the coupling element to be reciprocally moved, and the motor
is connected to a gear engaged to the gear rack.
17. The projecting system as claimed in claim 12, wherein the
light-filtering unit comprises a band-pass filter.
18. The projecting system as claimed in claim 17, wherein the
band-pass filter comprises a normal line, wherein the normal line
of the band-pass filter is parallel to the light path of the first
colored light when the light-filtering unit is in the first status,
and the normal line of the band-pass filter is not parallel to the
light path of the first colored light when the light-filtering unit
is in the second status.
19. The projecting system as claimed in claim 18, wherein the
normal line of the band-pass filter is angled with the light path
of the first colored light from 20 to 30 degrees when the
light-filtering unit is in the second status.
20. The projecting system as claimed in claim 19, wherein the
driving unit further comprises a frame provided for installation of
the rear light filtering sheet, and the coupling element is a cam
lever coupled to the frame and driven by the driving element to be
reciprocally rotated.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This Application claims priority of Taiwan Patent
Application No. 096139869, filed on Oct. 24, 2007, the entirety of
which is incorporated by reference herein.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a light-filtering module, and more
particularly to a light-filtering module applied in a projecting
system.
[0004] 2. Description of the Related Art
[0005] When projectors are in use, output effects are required for
particular situations, such as home theatre projectors with real
color and brief report projectors with high brightness.
[0006] FIG. 1 is a spectrum energy distribution diagram of a UHP
light source. For visible light within the range between 380-780 nm
wavelength, two high energy peaks of 550 nm wavelength of green
light and 570 nm wavelength of yellow light, are characterized with
the following features when used in projectors for different
applications.
[0007] For home-theatre projectors to approach real color, a
precise color performance and green light precisely purified by
filters are required. Thus, the filters are configured to block 570
nm wavelength of yellow light, i.e., allowing penetration of 550 nm
wavelength of green light. Because 570 nm wavelength of yellow
light is being neglected, brightness of home-theatre projectors is
therefore lowered.
[0008] For brief-report projectors to be used by several users at
the same time, a high brightness output is required. Thus, the
filters are configured to block 550 nm wavelength of green light,
i.e., allowing penetration of 570 nm wavelength of yellow light.
Because 570 nm wavelength of yellow light is allowed to penetrate,
brightness of brief-report projectors can be increased. However,
due to 550 nm wavelength of green light contained with the yellow
light, color performance of brief-report projectors may be
hindered, as the green light contained with the yellow light is
incorporated with lights containing real colors.
[0009] Based on the described features of the home-theatre and
brief-report projectors, there is no projector capable of providing
precise color performance and high brightness output.
BRIEF SUMMARY OF THE INVENTION
[0010] To provide precise color performance and high brightness
output in a projector, the invention provides a light-filtering
module applied in a projecting system, capable of providing
conversion of high-brightness output mode and a precise-color
output mode. The projecting system comprises a light-source module,
a dichroic mirror and a first image unit. The light-source module
outputs a light beam. The dichroic mirror divides the light beam
into a first colored light and a dual colored light. The first
image unit provides the first colored light with image information.
The light-filtering module comprises a light-filtering unit and a
driving unit. The light-filtering unit located between the dichroic
mirror and the first image unit is located at a light path of the
first colored light. The driving unit comprises a coupling element
coupled to the light-filtering unit and a driving element utilized
to drive the coupling element. The driving element drives the
light-filtering unit to be switched between a first status and a
second status by the coupling element, and a wide-wavelength
spectrum and a narrow-wavelength spectrum are provided when the
light-filtering unit is in the first and second statuses,
respectively.
[0011] The invention is characterized in that the light-filtering
unit can be switched between the first status capable of allowing
penetration of the wide-wavelength spectrum and the second status
capable of allowing penetration of the narrow-wavelength spectrum
by the controlled driving unit. When the light-filtering unit is in
the first status, the wide-wavelength spectrum is allowed to
penetrate the light-filtering unit, and the two high energy peaks
of the first colored light are allowed to penetrate the
light-filtering unit, thus, obtaining the high brightness output.
When the light-filtering unit is in the second status, the
narrow-wavelength spectrum is allowed to penetrate the
light-filtering unit, and only the high energy peak of green light
within the first colored light is allowed to penetrate the
light-filtering units and provide precise wavelength, thus,
obtaining precise color output while incorporating with other
colored lights. Thus, conversion of high-brightness output mode and
a precise-color output mode is obtained by the light-filtering
module applied in the projecting system.
[0012] A detailed description is given in the following embodiments
with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The invention can be more fully understood by reading the
subsequent detailed description and examples with references made
to the accompanying drawings, wherein:
[0014] FIG. 1 is a spectrum energy distribution diagram of an UHP
light source;
[0015] FIG. 2 is a top view of a light-filtering module of a first
embodiment of the invention, applied in a projecting system;
[0016] FIG. 3 is a schematic view of penetration rate of each
wavelength, representing the filtering characteristics of a
light-filtering unit of the first embodiment;
[0017] FIG. 4 is a side view of a driving unit of the
light-filtering module of the first embodiment;
[0018] FIG. 5 is a top view of a light-filtering module of a second
embodiment of the invention, applied in a projecting system;
and
[0019] FIG. 6 is a side view of a driving unit of the
light-filtering module of the second embodiment.
DETAILED DESCRIPTION OF THE INVENTION
[0020] The following description is of the best-contemplated mode
of carrying out the invention. This description is made for the
purpose of illustrating the general principles of the invention and
should not be taken in a limiting sense. The scope of the invention
is best determined by reference to the appended claims. Note that
the same elements in the following embodiments are marked by the
same reference numbers.
[0021] In FIGS. 2 and 3, a light-filtering module of a first
embodiment is applied in a projecting system 9a. The projecting
system 9a comprises a light-source module 91, a light-management
module 92, a signal module 93 and a projecting lens 94.
[0022] The light-source module 91 outputs a white light beam 95
characterized with a first polar. The light-management module 92
comprises a dichroic mirror 921, a plurality of reflecting parts
922, a phase plate 923, a first polar beam-splitter 924, a second
polar beam-splitter 925 and a dichroic prism 926. The dichroic
mirror 921 is utilized to divide the white light beam 95 into a
first colored light 951 and a dual colored light 952. The
reflecting parts 922 are utilized to reflect the first colored
light 951 and the dual colored light 952, respectively. The first
colored light 951 characterized with the first polar is converted
into the first colored light 951 characterized with the second
polar by the phase plate 923, and the first colored light 951
characterized with a second polar is inputted to the first polar
beam-splitter 924. The dual colored light 952 characterized with
the first polar is inputted to the second polar beam-splitter 925
and adhered on the first polar beam-splitter 924. The dichroic
prism 926 adhered on the second polar beam-splitter 925 is utilized
to divide the dual colored light 952 into a second colored light
953 and a third colored light 954.
[0023] The signal module 93 comprises a first image unit 931, a
second image unit 932 and a third image unit 933. The first image
unit 931 disposed next to the first polar beam-splitter 924 is
utilized to convert the first colored light 951 characterized with
the second polar into the first colored light 951 characterized
with the first polar. The second and third image units 932 and 933
disposed next to the dichroic prism 926 are utilized to convert the
second and third colored lights 953 and 954 characterized with the
first polar into the first colored light 951 characterized with the
second polar, respectively. The first, second and third image units
931, 932 and 933 provide the corresponded first, second and third
colored light 951, 953 and 954 with image information.
[0024] The projecting lens 94 disposed next to the second polar
beam-splitter 925 is utilized to provide the second polar
beam-splitter 925 for projecting the first, second and third
colored light 951, 953 and 954 contained with image information
therein. In this embodiment, the first, second and third colored
light 951, 953 and 954 are primary green, blue and red lights,
respectively.
[0025] The light-filtering module applied in a projecting system 9a
comprises a light-filtering unit 1 and a driving unit 2. The
light-filtering unit 1, located between the dichroic mirror 921 and
the first image unit 931 and located at a light path of the first
colored light 951, comprises a front light filtering sheet 11 and a
rear light filtering sheet 12. The front light filtering sheet 11
is suitable to be penetrated by a first wavelength range spectrum
and the rear light filtering sheet 12 is suitable to be penetrated
by a second wavelength range spectrum. That is, the front light
filtering sheet 11 can provide the first wavelength range, and the
rear light filtering sheet 12 can provide the second wavelength
range. In the first embodiment corresponding to an energy
distribution diagram of a present UHP light source shown in FIG. 1,
the first wavelength range spectrum and the second wavelength range
spectrum can be obtained as real and phantom lines shown in FIG. 3,
respectively. Thus, the first wavelength range of the first
wavelength spectrum is wider than the second wavelength range of
the second wavelength spectrum.
[0026] Referring to FIG. 4, the driving unit 2 comprises a frame
21, a coupling element 22, a driving element 23 and two rails 24.
The frame 21 is provided for installation of the rear light
filtering sheet 12. The coupling element 22 is coupled to the rear
light filtering sheet 12 of the light-filtering unit 1. The driving
element 23 is utilized to drive the coupling element 22, thereby
switching the driven light-filtering unit 1 between a first status
and a second status. Thus, the light-filtering unit 1 situated in
the first and second statuses can provide a wide-wavelength
spectrum and a narrow-wavelength spectrum, respectively. The rails
24 are utilized to slideably guide the frame 21 and the rear light
filtering sheet 12. In the first embodiment, the coupling element
22 is a gear rack disposed on the frame 21 and motionally driven by
the driving element 23, the driving element 23 is a motor utilized
to drive the coupling element 22 to be reciprocally moved, and the
motor has a spindle connected to the gear 23g engaged to the gear
rack.
[0027] The following description is conversion of high-brightness
output mode and a precise-color output mode provided by the
projecting system 9a of the first embodiment.
[0028] In FIG. 4, when the output mode of the projecting system 9a
determined by the user is the high-brightness output mode, the
controlled driving element 23 is rotated to drive the rear light
filtering sheet 12 to be linearly moved via the coupling element
22, thereby removing the rear light filtering sheet 12 from the
light path of the first colored light 951 along direction D1. Thus,
only the front light filtering sheet 11 of the light-filtering unit
1 is located at the light path of the first colored light 951.
Further, caused by the first wavelength range spectrum
corresponding to the front light filtering sheet 11, two high
energy peaks of 550 nm wavelength of green light and 570 nm
wavelength of yellow light shown in FIG. 1 pass the front light
filtering sheet 11 and directly output to the following phase plate
923. Based on the description above, it is understood that the
light-filtering unit 1 presently is defined in the first status,
allowing for penetration of the wide-wavelength spectrum, i.e.,
high energy peak of 550 nm wavelength is allowed to penetrate the
light-filtering unit 1. Thus, the brightness output of the
projecting system 9a is increased, forming the high brightness
output.
[0029] When the output mode of the projecting system 9a determined
by the user is changed to the precise-color output mode from the
high-brightness output mode, the coupling element 22 is reversely
rotated, moving the rear light filtering sheet 12 back to the light
path of the first colored light 951 via the coupling element 22, as
shown in FIG. 2, and the front light filtering sheet 11 and the
rear light filtering sheet 12 of the light-filtering unit 1 are
located at the light path of the first colored light 951. Although
the high energy peaks of 550 nm wavelength of green light and 570
nm wavelength of yellow light, corresponding to the first
wavelength range spectrum of the front light filtering sheet 11,
are capable of penetrating the front light filtering sheet 11, the
high energy peak of 570 nm wavelength of yellow light, when
reaching the rear light filtering sheet 12, is not allowed to
penetrate the rear light filtering sheet 12 due to not
corresponding to the second wavelength range spectrum of the rear
light filtering sheet 12. That is, only the high energy peak of 550
nm wavelength of green light, capable of penetrating the front and
rear light filtering sheets 11 and 12 can directly output to the
following phase plate 923. Based on the description above, it is
understood that the light-filtering unit 1 presently is defined in
the second status, allowing for penetration of the
narrow-wavelength spectrum, i.e., high energy peak of 550 nm
wavelength is allowed to penetrate the light-filtering unit 1,
thus, purifying the green light output of the projecting system 9a
and obtaining precise color output while incorporating with other
colored lights.
[0030] In the first embodiment, with respect to the light path of
the first colored light 951, it is note that the front and rear
light filtering sheets 11 and 12 located at the light path of the
first colored light 951 and adjacently arranged apart are disposed
ahead of the phase plate 923. Although this arrangement of the
front and rear light filtering sheets 11 and 12 is not allowed for
a limited space, the front and rear light filtering sheets 11 and
12 located at the light path of the first colored light 951 can be
taken apart for disposal at different positions, e.g. rear or
front, with respect to other optical components, and conversion of
high-brightness output mode and a precise-color output mode
provided by the projecting system 9a can still be provided.
Further, in the first embodiment, the first wavelength range of the
first wavelength spectrum is wider than the second wavelength range
of the second wavelength spectrum, conversion of high-brightness
output mode and a precise-color output mode provided by the
projecting system 9a can still be provided if the driving unit 2 is
connected to the front light filtering sheet 11.
[0031] In FIGS. 5 and 6, a light-filtering module 9b applied in a
projecting system of a second embodiment differs from the
light-filtering module 9a of the first embodiment in that a
light-filtering unit 3 only comprises a single band-pass filter 31
and a driving unit 4 is utilized to vary the angle of the band-pass
filter 31 with respect to the light path of the first colored light
951, thereby providing conversion of high-brightness output mode
and a precise-color output mode. The band-pass filter 31 has a
normal line N.
[0032] The light-filtering unit 3, disposed between the dichroic
mirror 921 and the first image unit 931 as well as located at the
light path of the first colored light 951, comprises the band-pass
filter 31 providing a wide-wavelength spectrum to be penetrated. In
FIG. 3, a real line represents spectrum energy distribution diagram
of the UHP light source of FIG. 1.
[0033] The driving unit 4 comprises a frame 41, a coupling element
42, and a driving element 43. The frame 41 is provided for
installation of the band-pass filter 31. The coupling element 42 is
coupled to the band-pass filter 31 of the light-filtering unit 3
via the frame 41. The frame 41 comprises a supporting portion 411
and a slot 412. The driving element 43 is utilized to drive the
coupling element 42. In this embodiment, the coupling element 42 is
a cam lever having an end 421 coupled to the slot 412 of the frame
41, and the driving element 43 is a motor utilized to drive the
coupling element 42.
[0034] The following description is conversion of high-brightness
output mode and a precise-color output mode provided by the
projecting system 9b of the second embodiment.
[0035] In FIG. 5, when the output mode of the projecting system 9b
determined by the user is the high-brightness output mode, the
coupling element 42 driven by the driving element 43 is rotated,
moving the end 421 thereof along the slot 412 of the frame 41 to
approach the supporting portion 411 of the frame 41, to cause the
band-pass filter 31 to be disposed on the frame 41 perpendicular to
the light path of the first colored light 951. With respect to the
wide-wavelength spectrum of the band-pass filter 31, the high
energy peaks of 550 nm wavelength of green light and 570 nm
wavelength of yellow light shown in FIG. 1 are allowed to penetrate
the band-pass filter 31 and directly output to the following phase
plate 923. Based on the description above, it is understood that
the light-filtering unit 3 presently is defined in the first
status, allowing for penetration of the wide-wavelength spectrum,
i.e., high energy peak of 550 nm wavelength is allowed to penetrate
the light-filtering unit 3. Thus, the brightness output of the
projecting system 9b is increased, forming the high brightness
output.
[0036] When the output mode of the projecting system 9b determined
by the user is changed to the precise-color output mode from the
high-brightness output mode, the coupling element 42 driven by the
driving element 43 is rotated, moving the end 421 thereof along the
slot 412 of the frame 41 to stay away from the supporting portion
411 of the frame 41, thereby causing the frame 41 not to be
perpendicular to the light path of the first colored light 951.
That is, the normal line N of the band-pass filter 31 is parallel
to the light path of the first colored light 951 when the
light-filtering unit 1 is in the first status, and the normal line
N of the band-pass filter 31 is not parallel to the light path of
the first colored light 951 when the light-filtering unit 1 is in
the second status. In FIG. 6, an angle .theta., ranging from 20 to
30 degrees, is formed between the normal line N of the band-pass
filter 31 and the light path of the first colored light 951 when
the light-filtering unit 1 is in the second status, and the
permeable range for the first colored light 951 with respect to the
band-pass filter 31 is shifted to the narrow-wavelength spectrum
from the wide-wavelength spectrum, which is provided when the frame
41 is perpendicular to the light path of the first colored light
951.
[0037] That is, when the band-pass filter 31 is changed to a
perpendicular state from a non-perpendicular state with respect to
the light path of the first colored light 951, the penetrable
wavelength range for the first colored light 951 to the band-pass
filter 31 is gradually shifted toward the narrow-wavelength
spectrum from the wide-wavelength spectrum with the increasing
angle .theta.. For example, when the angle .theta. is increased to
27.5 degree from 0 degree, the narrow-wavelength spectrum is
shifted to the wide-wavelength spectrum. Finally, only the high
energy peak of 550 nm wavelength of green light can pass the
band-pass filter 31 and directly output to the following phase
plate 923.
[0038] Based on the description above, it is understood that the
light-filtering unit 1 presently is defined in the second status,
allowing for penetration of the narrow-wavelength spectrum, i.e.,
high energy peak of 550 nm wavelength is allowed to penetrate the
light-filtering unit 3, thus, purifying the green light output of
the projecting system 9b and obtaining precise color output while
incorporating with other colored lights.
[0039] Thus, it is understood that the light-filtering units 1 and
3 of the light-filtering modules of the described embodiments can
be switched between the first status capable of allowing
penetration of the wide-wavelength spectrum and the second status
capable of allowing penetration of the narrow-wavelength spectrum
by the controlled driving units 2 and 4. When the light-filtering
units 1 and 3 are in the first status, the wide-wavelength spectrum
is allowed to penetrate the light-filtering units 1 and 3, and the
two high energy peaks of the first colored light 951 are allowed to
penetrate the light-filtering units 1 and 3, thus, obtaining the
high brightness output. When the light-filtering units 1 and 3 are
in the second status, the narrow-wavelength spectrum is allowed to
penetrate the light-filtering units 1 and 3, and only the high
energy peak of green light within the first colored light 951 is
allowed to penetrate the light-filtering units 1 and 3 and provided
with precise wavelength, thus, obtaining precise color output while
incorporating with other colored lights. Thus, conversion of
high-brightness output mode and a precise-color output mode is
obtained by the light-filtering module applied in the projecting
system.
[0040] While the invention has been described by way of example and
in terms of the preferred embodiments, it is to be understood that
the invention is not limited to the disclosed embodiments. To the
contrary, it is intended to cover various modifications and similar
arrangements (as would be apparent to those skilled in the art).
Therefore, the scope of the appended claims should be accorded the
broadest interpretation so as to encompass all such modifications
and similar arrangements.
* * * * *